Microstructural control of Nb-Si alloy with invariant reactions

S. Miura, J. H. Kim, K. Ohkubo, Y. Kimura, N. Sekido, Y. Mishima, Tetsuo Mori

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Various investigations have been attempted to improve the low temperature ductility of Nb-silicides by microstructural control while they show superior high temperature strength. Present authors have focused on the microstructure evolution through the eutectic and eutectoid reactions in Nb-rich portion of Nb-Si binary system, and with small amounts of additives (Zr or Mg) alloys large Nb grains with fine suicide (α-Nb5Si3) particles have been obtained, which is attractive for high temperature use. For further understanding of this phenomenon, the present study has two objectives; one is to apply the advanced solidification technique for further microstructure control, and the other is to investigate the effect of co-existence of Zr and trace amount of Mg on the microstructure evolution during the eutectoid reaction in terms of the interfacial energy between phases. EBSD analysis revealed that uni-directionally solidified alloy show the same crystallographic orientation relationship (O.R.) between Nb and α-Nb5Si3 with that in arc-melted alloy having the same composition. On the other hand, Mg-doped alloy containing Zr shows an O.R. which was not observed in previous works. This implies that Mg doping is effective to control the interfacial energy between Nb and α-Nb5Si3 even in Nb-Si-Zr alloys. Two-step heat-treatment is found to be effective to obtain finer microstructure, and a further investigation on the controlling factors of eutectoid decomposition will provide a proper route to well-controlled microstructures.

本文言語English
ホスト出版物のタイトルSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
出版社Trans Tech Publications Ltd
ページ1507-1512
ページ数6
PART 2
ISBN(印刷版)0878494286, 9780878494286
DOI
出版ステータスPublished - 2007
外部発表はい
イベント5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
継続期間: 2006 7月 42006 7月 8

出版物シリーズ

名前Materials Science Forum
番号PART 2
539-543
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
国/地域Canada
CityVancouver
Period06/7/406/7/8

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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